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� • i <br /> %.i N400 <br /> STANDARD OPERATING PROCEDURE <br /> HIGH VACUUM DUAL PHASE EXTRACTION <br /> High Vacuum Dual Phase Extraction <br /> Before performing the high vacuum vapor extraction pilot test, any necessary air permits shall be obtained <br /> and the test will be performed in accordance with any requirements stated in the permit. Ambient pressure <br /> readings will be measured at the observation wells prior to the start of the test. The pilot test will be <br /> conducted by applying a vacuum to a well with a blower to extract soil-gas. The test will be conducted at <br /> ti.r three steps of increasing applied vacuum. The final step of the test will be conducted at the maximum <br /> applied vacuum of the blower. A step will be considered complete when vacuum influence measured in <br /> observation wells stabilized for two consecutive readings. <br /> r.0 The following measurements will be made during each step of the test: <br /> • The vacuum applied to the well will be measured with a vacuum gauge. The applied vacuum will be <br /> controlled and adjusted with dilution valve. <br /> Lo <br /> • The concentration of hydrocarbon volatiles and oxygen in the soil-gas extracted from the well will <br /> be monitored during each step of the test using a flame ionization detector (FID) or a photo <br /> ionization detector(PID), and Gastecho meter. <br /> • The vacuum influence in observation wells will be measured in inches of water (vacuum) with <br /> Magnehelic gauges. <br /> The soil-gas extraction flow rate at the extraction well will be measured during each step of the test, <br /> • once the vacuum has stabilized, using a thermal anemometer,or pitot tube and Magnehelice gauges. <br /> La A soil-gas sample will be collected at the maximum applied vacuum in a Tedlarrm bag for laboratory <br /> analysis. The samples will be analyzed for volatile fuel hydrocarbons(VFH)and BTEX using EPA Method <br /> TO-14 at a California DHS-certified lab. The extracted soil-gas will be treated with an internal combustion <br /> LO engine, or thermal oxidizer. The appropriate air quality control permit will be procured for the internal <br /> combustion engine, or thermal oxidizer. <br /> The total gallons of groundwater removed during the pilot test will be recorded on a flow meter. This will <br /> t., be used to determine the total number of gallons extracted during the test. Depth to groundwater <br /> measurements will be collected from surrounding observation wells at periodic time intervals. The test will <br /> be conducted for 24 hours. <br /> 6-' An effluent water sample shall be collected during the pilot test. The analytical data can be used to design a <br /> groundwater remediation system. Additional sampling may be required by conditions of a discharge permit. <br /> If water is being stored in a holding tank, appropriate samples will be collected per disposal requirements. <br /> 6.0 The water will be removed to an appropriate disposal facility by a licensed transporter. <br /> Ir <br /> La <br /> 1. <br />